[PATCH] qemuDomainChangeNet: forbid changing portgroup

[Adam Julis <ajulis@xxxxxxxxxx>]

While changing the portgroup attribute causes incorrect
behavior, this option is disabled for hot-plug.

Resolves: https://issues.redhat.com/browse/RHEL-7299
Signed-off-by: Adam Julis <ajulis@xxxxxxxxxx>
---
 src/qemu/qemu_hotplug.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
index 4a3f4f657e..355f742535 100644
--- a/src/qemu/qemu_hotplug.c
+++ b/src/qemu/qemu_hotplug.c
@@ -3884,6 +3884,13 @@ qemuDomainChangeNet(virQEMUDriver *driver,
         goto cleanup;
     }
 
+    if (newdev->type == VIR_DOMAIN_NET_TYPE_NETWORK &&
+        STRNEQ_NULLABLE(olddev->data.network.portgroup, newdev->data.network.portgroup)) {
+        virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",
+                       _("cannot modify network device portgroup attribute"));
+        goto cleanup;
+    }
+
     /* allocate new actual device to compare to old - we will need to
      * free it if we fail for any reason
      */
-- 
2.45.2